26 March 2016

Larval Host Plant for Butterflies: Yellow Saraca

This 8th instalment of our Butterflies' Larval Host Plants series features Saraca thaipingensis (Yellow Saraca), a species of the family Fabaceae (Bean Family) which has members taking on a variety of growth forms (tree, shrub, herb, vine, liana).
The Yellow Saraca is a perennial member of this family which assumes the tree form.
The species name "thaipingensis" has the meaning "of or from Taiping, Malaysia".

Yellow Saraca is native to the Southeast Asia region, but it is also widely cultivated in a number of tropical and sub-tropical countries for its attractive yellow inflorescence and drooping pink/purple young leaves. In Singapore, the Yellow Saraca can be found in many parks and gardens as ornamental trees. Besides its obvious ornamental purpose, Yellow Saraca has potential medicinal uses as extracts of its flowers, leaves and twigs have been found to have antimicrobial and antioxidant properties in recent studies.

A Yellow Saraca tree next to the Symphony Lake in the Singapore Botanic Gardens.

Yellow Saraca is a medium-sized, evergreen tree which can grow up to about 8m in height. The fully grown tree has a wide spreading crown.

A flowering Yellow Saraca tree in the Mount Faber Park.

Another Yellow Saraca tree in the Singapore Botanic Gardens.

Leaves of the Yellow Saraca are simple pinnate (with no terminal leaflet) with 4 to 8 pairs of opposite leaflets, each of which is lanceolate in shape and can grow up to 8-25cm long. Young leaves occurs in drooping form and are initially dark reddish brown. As it grows larger, the tender leaflets turns pink or purple colour, before finally turning green and stiffen.

Young leaves of the Yellow Saraca in its early stage of development.

Drooping young leaves of the Yellow Saraca in cream/pink coloration.

A wide-field view of
both young and mature leaves of the Yellow Saraca.

A Yellow Saraca tree in Singapore Botanic Gardens with attractive pink/purple young leaves.

Mature leaves of the
Yellow Saraca.

Flowers of the Yellow Saraca occur in dense clusters each of which is up to 40cm broad and arises from trunk, stems or branches. Each flower is small, about 2cm in diameter, initially pale yellow, turning deep yellow with a crimson eye-spot. Most flowers are functionally male with the rest bisexual. Flowers of the Yellow Saraca are mildly fragrant. It is interesting to note that each flower bears no petals but 4 sepals.

Clusters of flower buds of the
Yellow Saraca arising from a branch.

Closer view of a cluster of flower buds of the Yellow Saraca.

Closer view of a cluster of flowers of the Yellow Saraca.

Left: A functionally male flower; Right: A bisexual flower of the Yellow Saraca.

Each fruit is a thin and flat pod. When fully developed, it is purple and large, 20-45cm long and 4-8cm broad. When ripened, the fruit turns dark brown and splits into two halves, exposing the flat, black seeds.

Young pods of the Yellow Saraca in very early stage of development.

Fully developed pods of the Yellow Saraca.

Ripened pods of the Yellow Saraca.

When a Yellow Saraca tree is in bloom, it could attract many nectar-seeking visitors such as various species of butterflies, other insects and birds.

Butterflies visiting flowers of the Yellow Saraca.

Various insects found on flowers of the Yellow Saraca.

A nectar-seeking bird found among flower clusters of the Yellow Saraca.

Eggs of these butterfly species are laid on flower parts or on the surface of young leaves or stem. In the case of the Ciliate Blue, the eggs are laid in a tight cluster while those of the other seven are laid singly.

A female Glistening Caerulean laying an egg in the flower cluster of the Yellow Saraca.

An egg of the Sky Blue laid on a flower sepal of the Yellow Saraca.

Caterpillars of the three Jamides species and Copper Flash feed on the flower parts of the Yellow Saraca, whilst those of the Common Tit, Common Posy, Semanga superba deliciosa and Ciliate Blue feed on young leaves of the Yellow Saraca. They possess the usual nectary organs which attract attending ants.

A caterpillar of the Glistening Caerulean on the flower part of the Yellow Saraca.

A caterpillar of the Sky Blue on the flower part of the Yellow Saraca.

A caterpillar of the Metallic Caerulean on the flower part of the Yellow Saraca.

A caterpillar of the Ciliate Blue being attended by a group of weaver ants.

A caterpillar of the Common Posy resting on a leaf of the Yellow Saraca.

A caterpillar of Semanga superba deliciosa on a leaf of the Yellow Saraca.

A caterpillar of the Copper Flash nibbling away on a flower of the Yellow Saraca.

Caterpillars of these lycaenid species pupate either on a leaf surface or in a leaf litter. In the case of the Common Posy, the pupation site is typically a spot on a stem or branch.

Two views of a pupa of the Ciliate Blue on a young leaf of the Yellow Saraca.

Two views of a pupa of the Metallic Caerulean on a leaf surface.

Two views of a pupa of the Common Posy on a stem.

With so much insect and bird activities observable in a blooming Yellow Saraca tree, it is always worthwhile to check out such a tree that you happen to chance upon in one of our many parks and gardens.

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